-3a-9=18

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Solution for -3a-9=18 equation: 



-3a-9=18

We move all terms to the left:

-3a-9-(18)=0

We add all the numbers together, and all the variables

-3a-27=0

We move all terms containing a to the left, all other terms to the right

-3a=27

a=27/-3

a=-9

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